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Parergodrilidae
Parergodrilidae is an enigmatic family of polychaetes with only two genera, one living on the coast, the other terrestrial. They share much in common with the clitellates, but molecular data place them with Questa and Orbiniidae Orbiniidae is a family of polychaete worms. Orbiniids are mostly unselective deposit feeders on marine detritus. They can be found from the neritic zone to abyssal depths. The family was revised in 1957 by Hartman and some further revisions w .... References Polychaetes {{annelid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polychaete
Polychaeta () is a paraphyletic class of generally marine annelid worms, commonly called bristle worms or polychaetes (). Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. More than 10,000 species are described in this class. Common representatives include the lugworm (''Arenicola marina'') and the sandworm or clam worm ''Alitta''. Polychaetes as a class are robust and widespread, with species that live in the coldest ocean temperatures of the abyssal plain, to forms which tolerate the extremely high temperatures near hydrothermal vents. Polychaetes occur throughout the Earth's oceans at all depths, from forms that live as plankton near the surface, to a 2- to 3-cm specimen (still unclassified) observed by the robot ocean probe ''Nereus'' at the bottom of the Challenger Deep, the deepest known spot in the Earth's oceans. Only 168 species (less than 2% of all polychaetes) are known from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clitellata
The Clitellata are a class of annelid worms, characterized by having a clitellum - the 'collar' that forms a reproductive cocoon during part of their life cycles. The clitellates comprise around 8,000 species. Unlike the class of Polychaeta, they do not have parapodia and their heads are less developed. Characteristics Clitellate annelids are segmented worms characterised by the clitellum or girdle which is located near the head end of mature individuals. The mouth is on the ventral surface and is overhung by the prostomium (proboscis). The brain is not located in the head but in one of the body segments. The clitellum is formed by a modification of several segments, and either includes the female gonopores or is located just behind them. During copulation, this glandular tissue secretes mucus that keeps the paired individuals together while they exchange sperm. Afterwards it secretes material that forms a cocoon that encircles the animal's body and encloses the eggs and spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orbiniidae
Orbiniidae is a family of polychaete worms. Orbiniids are mostly unselective deposit feeders on marine detritus. They can be found from the neritic zone to abyssal depths. The family was revised in 1957 by Hartman and some further revisions were made by Blake in 2000.Blake, J.A. 2000. A new genus and species of polychaete worm (Family Orbiniidae) from methane seeps in the Gulf of Mexico, with a review of the systematics and phylogenetic interrelationships of the genera of Orbiniidae. Cah. Biol. Mar. 41: 435-449. Genera :*'' Alcandra'' :*'' Aricia'' Savigny, 1820 :*'' Berkeleyia'' :*'' Branchethus'' :*'' Califia'' :*''Clytie'' :*'' Falklandiella'' :*''Labotas'' :*''Lacydes'' :*'' Leitoscoloplos'' Day, 1977 :*'' Leodamas'' :*'' Microrbinia'' Hartman, 1965 :*''Naidonereis'' :*''Nainereis'' Blainville, 1828 :*'' Naineris'' Blainville, 1828 :*'' Orbinella'' :*'' Orbinia'' Quatrefages, 1865 :*'' Orbiniella'' Day, 1954 :*'' Paraorbiniella'' Rullier, 1974 :*'' Pararicia'' :*'' Pettib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
